This is the end of 2008, not the end of 2009 guys.
I would put it at around 34 million sellers, I see most nintendo games selling, but not many 3rd party titles.
edit: If the wii 3rd party sales manage to take off as everyone expects(everyone as in vgchartz) then I would see the wii with around 44 million sellers.
2008 end of year predictions:
PS3: 22M
360: 25M
wii: 40M